3 inches is 1/4th of one foot so to 20 ft is 1/80th
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18 inches = 1.5 feet, so 18 inches : 10 feet = 1.5 feet : 10 feet = 3 : 20
3 feet is 36 inches and so the ratio is 6 to 1
3 feet equals 36 inches so the ratio is 2:36 and you can simplify it to get 1:18.
The ratio of 153 inches to 17 feet is 153:204, or simplified as 3:4.
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